Search found 24 matches

by tom-rock
Sun Mar 22, 2015 12:57 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Re: Stirling engine with rhombic drive 75 ccm

Hi, in his book A. Ross writes on several places 230 W at 2,7 bar for this engine and also in third party literature I found this value. And you are right with the Beale number, thats why they are called the benchmark engines. But when I look at the effort they made in research and development in th...
by tom-rock
Sun Mar 22, 2015 11:51 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Re: Stirling engine with rhombic drive 75 ccm

Hi Aviator, the engine of Andy Ross you mentioned delivers 230 W with 2,7 bar pressure, which ends up in a Beale number of normal range. Comprehensive explanation of the Beale number you will find in older literature e.g. I have the book of Colin West "Principles and Applications of Stirling En...
by tom-rock
Sat Mar 21, 2015 12:55 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Re: Stirling engine with rhombic drive 75 ccm

Hi Aviator, on which calculations is your statement based? When I use the basic Beale equation just to estimate the power output of a carefully designed engine : P = Bn*Pm*f*V0 where Bn = Beale number = 0,15 for a professional designed Stirling (average of commercial engines) , a high Temperature di...
by tom-rock
Fri Mar 20, 2015 12:46 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heat exchanger design with FastTrack, FlexiScale and ReScale
Replies: 1
Views: 3588

Heat exchanger design with FastTrack, FlexiScale and ReScale

Hi all, for my Stirling engine new heat exchangers are in the planning stage using FastTrack, FlexiScale and ReScale by Dr. A. Organ for a target power of several hundred Watts. If anybody is familar with the scaling methods of Dr. A. Organ I would be very thankful if u contact me here or via e-mail...
by tom-rock
Fri Mar 20, 2015 12:37 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Re: Stirling engine with rhombic drive 75 ccm

Hi,

power is much increased and an Arduino is added to measure engine data.

I added a new video with many updates at this link:

https://youtu.be/k3XNxzmMoWI

Ralf
by tom-rock
Sat Mar 08, 2014 3:14 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Re: Stirling engine with rhombic drive 75 ccm

Hi all, many thanks for your kind comments, there are a lot of interesting ideas and suggestions. I will try pressurising the engine as soon as I improved the other obviously weak points friction, compression and regenerator. The engine is prepared for pressurization up to ten bar, just the seals ar...
by tom-rock
Fri Mar 07, 2014 2:03 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Re: Stirling engine with rhombic drive 75 ccm

Hi Ian, I use piston rings because the engine is completely dry-running and for a long-lasting performance this seems for me to be the only way. I tried a solid graphit piston which sealed beautifully perfect but friction was to high and without doubt it wouldnt´t stand longer then 100 hours. Pressu...
by tom-rock
Thu Mar 06, 2014 3:20 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engine with rhombic drive 75 ccm
Replies: 28
Views: 22656

Stirling engine with rhombic drive 75 ccm

Hi all, after reading a lot in this beautiful Stirling forum I want to show you my own work on the topic. Its a 75 ccm Rhombic Stirling with finned heat exchangers and regenerator, completely dry-running. Still unpressurized because a lot things have to be improved before. The main challenge at this...
by tom-rock
Tue Feb 25, 2014 2:17 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: New Members PLEASE read! - OR, having problems registering, being deactivated
Replies: 511
Views: 493274

Re: "Hi" We are new here!

Hi,

thanks for letting me be a member of this forum.

Ralf